Mailchimp Transactional (formerly Mandrill) vs Postmark
Mailchimp Transactional (formerly Mandrill)
mailchimp.com
Postmark
postmarkapp.comSide by side
| Figure | Mailchimp Transactional (formerly Mandrill) | Postmark |
|---|---|---|
| Price from | $10/mo | $5/mo |
| Free plan | — | Yes |
| Free trial | Yes | Yes |
| Open source | — | — |
| Web | Yes | Yes |
| API | — | Yes |
| Plans published | 12 | 8 |
| Spec score · Transactional email services | 8.8 (#5) | 9.2 (#1) |
| Spec score · Transactional Email Software | 8.6 (#10) | 8.7 (#7) |
| Dedicated IP option | Yes | Yes |
| Delivery methods | both | Postmark supports REST API, SMTP, and multi-region SMTP routing. |
| Free plan | No | Yes |
| Monthly send limit | 25000 | 10000 |
| Unused email policy | Unused emails do not roll over month to month. | Unused emails do not carry into the next billing period. |
Plans
Mailchimp Transactional (formerly Mandrill)
- 1–20 blocks$20 a month
- 21–40 blocks$18 a month
- 41–80 blocks$16 a month
- 81–120 blocks$14 a month
- 121–160 blocks$12 a month
- 161+ blocks$10 a month
- Free trialFree
- 121-160 blocks$12 a month
- 81-120 blocks$14 a month
- 41-80 blocks$16 a month
Postmark
- FreeFree
- Basic$15 a month
- Pro$16.50 a month
- Platform$18 a month
- Custom activity retention$5 a month
- DMARC monitoring$14 a month
- Dedicated IP$50 a month
- High-volume plansPriced on request
In their own words
Mailchimp Transactional (formerly Mandrill)
Mailchimp Transactional (formerly Mandrill) has no write-up on Specifiction yet; its figures are above.
Postmark
Postmark delivers and tracks application email as an alternative to SMTP or Sendmail. It separates transactional and broadcast messages into different Message Streams and IP infrastructure. Developers can send through REST API, SMTP, or multi-region SMTP routing, with official libraries for Node.js, Python, Rails, Ruby, PHP, and.NET. Inbound messages can be converted to JSON and sent to a webhook URL. Tracking includes delivery, bounces, spam, opens, and links, with event webhooks. Editable responsive templates cover transactional messages such as password resets, receipts, and invitations. The free Developer plan costs nothing, provides 100 emails per month, permits no overages, and does not expire. Basic starts at $15 a month for 10,000 emails per month; extra emails cost $1.80 per 1,000 and are calculated at the end of the billing cycle. Unused emails do not roll over. Postmark lists API and web access. Its iOS app was sunset in June 2025 and is no longer supported.